It seems incredibly wrong to assume that there was only 1 issue with 12WHPWR. 12V-2x6 was an improvement that eliminated some potential issues, not all of them. If you want to eliminate all of them, replace the 12 current carrying wires with 2 large gauge wires. Then the wires cannot become unbalanced. Of course, the connector would need to split the two into 12 very short wires to be compatible, but those would be recombined on the GPU’s PCB into a single wire.